I 400x300x6x18 Cintac · Weight & Dimensions

Cintac, welded sections · Wide Flange (I-beam)

Wide flange beams (W shapes / I-beams) are the most common structural steel profile used in building construction. They are used for beams, columns, and girders in steel-framed buildings and bridges. Designed per AISC 360, Eurocode 3, and NBR 8800.

Also known as: I 400x300x6x18 (México) · Doble T I 400x300x6x18 (Argentina / LATAM) · UB 400 (UK / Australia)

The I 400x300x6x18 steel profile weighs 101.9 kg/m (68.47 lb/ft), has a depth of 400 mm (15.75 in), flange width 300 mm (11.81 in). Cross-sectional area: 12,984 mm². Moment of inertia Ix = 41,840.067 cm⁴, Iy = 8,100.655 cm⁴.

Cross-section (not to scale)

Dimensions

Property	Metric	Imperial
Depth (h)	400 mm	15.75 in
Width (b)	300 mm	11.81 in
Web thickness (tw)	6 mm	0.24 in
Flange thickness (tf)	18 mm	0.71 in
Weight	101.9 kg/m	68.47 lb/ft

Section Properties

Property	Metric	Imperial
Area (A)	12,984 mm²	20.125 in²
Moment of inertia (Ix)	41,840.07 cm⁴	1005.21 in⁴
Moment of inertia (Iy)	8,100.66 cm⁴	194.62 in⁴
Elastic section modulus (Sx)	2,092 cm³	127.662 in³
Elastic section modulus (Sy)	540.04 cm³	32.956 in³
Plastic section modulus (Zx)	2,261.54 cm³	138.008 in³
Plastic section modulus (Zy)	813.28 cm³	49.629 in³
Radius of gyration (rx)	17.95 cm	7.067 in
Radius of gyration (ry)	7.9 cm	3.110 in